CVEvulnerability

CVE-2026-3255

6.5 MEDIUM Published 2026-02-27 Modified 2026-06-17 Official page ↗
Status
Analyzed
Published
2026-02-27
Last modified
2026-06-17
Assigner
9b29abf9-4ab0-4765-b253-1875cd9b441e
CVSS 3.1 ([email protected])
6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Weaknesses
CWE-338, CWE-340

Description

HTTP::Session2 versions before 1.12 for Perl for Perl may generate weak session ids using the rand() function. The HTTP::Session2 session id generator returns a SHA-1 hash seeded with the built-in rand function, the epoch time, and the PID. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand() function is unsuitable for cryptographic usage. HTTP::Session2 after version 1.02 will attempt to use the /dev/urandom device to generate a session id, but if the device is unavailable (for example, under Windows), then it will revert to the insecure method described above.

Affected configurations

• tokuhirom http\ \ (< 1.12)

Related

Weakness · CWE (2)

  • CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) weakness
  • CWE-340 Generation of Predictable Numbers or Identifiers weakness

References